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A liquid quantity detecting device includes a float-type liquid-quantity meter and a torsion bar-type liquid meter. In the float-type liquid-quantity meter, the liquid quantity is detected by a float in a tank and the position of the float is converted to an electric signal by a variable resistor. T

A liquid quantity detecting device includes a float-type liquid-quantity meter and a torsion bar-type liquid meter. In the float-type liquid-quantity meter, the liquid quantity is detected by a float in a tank and the position of the float is converted to an electric signal by a variable resistor. The torsion bar-type liquid meter includes housings fixed to the tank, torsion bars, one end of each being fixed to the tank by the housings and the other end of each being fixed to a supporting member so that the torsion bars are twisted by weight of the tank, twisted angle detection means for detecting the twisted angle of the torsion bars, and an electrical processor for supplying a signal corresponding to the quantity of liquid in the tank after receiving a signal from the twisted angle detector. When the liquid quantity in the tank is larger than a predetermined quantity, the liquid quantity, for example, the quantity of gasoline in a gasoline tank, is measured by the floating-type liquid-quantity meter. When the liquid quantity in the tank is smaller than a predetermined quantity, the liquid quantity is displayed precisely and accurately by the torsion bar-type liquid meter.

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A liquid quantity detecting device for detecting the liquid quantity in a tank, comprising: (a) a float-type liquid-quantity meter having a float provided in said tank, means for generating an electric signal corresponding to the position of said float, and first display means for displaying the liq

A liquid quantity detecting device for detecting the liquid quantity in a tank, comprising: (a) a float-type liquid-quantity meter having a float provided in said tank, means for generating an electric signal corresponding to the position of said float, and first display means for displaying the liquid quantity in response to the signal from said generating means, said float-type liquid-quantity meter detecting and displaying the quantity of liquid stored in said tank when said quantity is larger than a predetermined quantity; and (b) a liquid meter comprising, (i) housings fixed to said tank; (ii) at least two torsion bar means, one end of each means being fixed to said tank by said housings and the other end of each means being fixed to a supporting member, for twisting in proportion to the weight of said tank and said liquid in said tank; (iii) twisted angle detection means for detecting an angle of the twisting of said torsion bar means, and comprising first and second electric members which are adapted to move relative to each other in proportion to the twisted angle of said torsion bar means, and are arranged facing each other, said second electric member being positioned at the center of said first electric member whenever said twisting is at a predetermined status defined as zero; (iv) electrical processing means for generating a signal corresponding to the quantity of liquid in said tank in response to detections of said twisted angle detection means; and (v) second display means for displaying liquid quantity in response to said signal from said electrical processing means when the quantity of said liquid to be measured is smaller than said predetermined quantity.